Norbert Fabián Čapek (3 June 1870 – ? October 1942) was the founder of the modern Unitarian Church in the Czech Republic.
Čapek was born into a Roman Catholic family on 3 June 1870, in Radomyšl, a village in Strakonice District in southern Bohemia. As a boy he wanted to join the priesthood, but soon became disillusioned with the church. At the age of 18 he left Catholicism for the Baptist church and was ordained a minister.
Čapek traveled widely as a Baptist evangelist, from Saxony in the west to the Ukraine in the east. In Moravia he was influenced by the free Christianity and the Moravian Brotherhood, and his religious convictions became progressively more liberal and anti-clerical. He wrote for and edited a number of journals. His articles on topics ranging from psychology to politics attracted unfavorable attention from the German authorities, and in 1914 he fled to the United States.
Čapek moved his family to the United States where he became editor of a Czech language newspaper. Pursuing his increasingly liberal religious perspective, he discovered Unitarianism and in 1921 joined the First Unitarian Church of Essex County (in Orange, New Jersey).